Libs-API Meeting 2025-03-04

tags: `Libs Meetings` `Minutes`

Meeting Link: https://meet.jit.si/rust-libs-meeting-crxoz2at8hiccp7b3ixf89qgxfymlbwr
Attendees: Amanieu, David, The 8472

Agenda

Triage
Anything else?

Triage

FCPs

7 rust-lang/rust T-libs-api FCPs

merge rust.tf/80437 Tracking Issue for `box_into_inner` - (1 checkboxes left)
merge rust.tf/106418 Implement `PartialOrd` and `Ord` for `Discriminant` - (2 checkboxes left)
merge rust.tf/130823 Tracking Issue for `non_null_from_ref` - (3 checkboxes left)
merge rust.tf/137280 stabilize ptr::swap_nonoverlapping in const - (4 checkboxes left)
merge rust.tf/115585 Tracking issue for `cfg_match` - (4 checkboxes left)
merge rust.tf/134213 Stabilize `naked_functions` - (4 checkboxes left)
merge rust.tf/136877 Fix missing const for inherent pointer `replace` methods - (3 checkboxes left)

traviscross (1), tmandry (1), dtolnay (2), nikomatsakis (3), Amanieu (3), scottmcm (2), m-ou-se (1), joshtriplett (3), BurntSushi (5)

(nominated) rust.tf/libs358 Update Windows exe search order (phase 2)

removing the current directory from the search path

Amanieu: let's discuss with Chris present

(nominated) rust.tf/libs546 Efficient integer formatting into fixed-size buffer

Counterproposal: n.format_into(&mut core::fmt::NumBuffer::new())

Amanieu to respond

(nominated) rust.tf/74985 Tracking Issue for slice::array_chunks

Last time we discussed a related design question: https://github.com/rust-lang/libs-team/issues/292#issuecomment-1820372426

The small meeting leans toward runtime panic

(nominated) rust.tf/122661 Change the desugaring of `assert!` for better error output

Breaking change for asserting on custom types implementing Not

Not a breaking change for &bool because the match will perform match ergonomics

Was there a crater? No

Let's FCP and crater in parallel

David to respond

(nominated) rust.tf/137198 Rename `cfg_match!` to `cfg_select!`

Josh: "meh". This seems close enough to a match, and the name seems reasonably intuitive. I don't think there's value in changing this, and select is a less familiar concept.

Last week agreed to discuss when Josh is available

Skip

(nominated) rust.tf/137654 Debug impls of ExtractIf have inconsistent trait bounds

David: my preference: none of the above. No bounds on T, no bounds on F, just print ExtractIf { .. } as the debug representation

8472: T: Debug bounds are important, F: FnMut bounds are less important. Slightly in favor of having them

David to write PR and propose FCP

(nominated) rust.tf/137928 stabilize const_cell

FCP proposed

(waiting on team) rust.tf/136687 Improve the documentation of `Display` and `FromStr`, and their interactions

(waiting on team) rust.tf/136912 Add missing trait implementations for ScopedJoinHandle

(new change proposal) rust.tf/libs554 Add `std::process::Output::exit_ok`

(new change proposal) rust.tf/libs553 Add a "shrink-if-excessive" API to `Vec`

(new change proposal) rust.tf/libs552 Provider-style API for `Context`

(new change proposal) rust.tf/libs551 ACP: std::os::unix::process::CommandExt::chroot

(new change proposal) rust.tf/libs550 `impl Display for CStr`

(new change proposal) rust.tf/libs549 Add `uNN::checked_sub_nonzero`

(new change proposal) rust.tf/libs548 ACP: Add `NonZero::<T>::from_str_radix`

(new change proposal) rust.tf/libs544 `Arc<impl !Sized>` constructors

(new change proposal) rust.tf/libs543 ACP: Slice to array version of `split_off`

(new change proposal) rust.tf/libs542 Concurrent Read-Write Locks on Slices

(stalled change proposal) rust.tf/libs379 Combine, an iterator adapter which statefully maps multiple input iterations to a single output iteration

(stalled change proposal) rust.tf/libs363 Un-specialize impl ToString

(stalled change proposal) rust.tf/libs350 std::slice::from_raw_parts alternative that would accept a null pointer if len == 0 by returning an empty slice

(stalled change proposal) rust.tf/libs207 `parse_line` method for `Stdin`

(stalled change proposal) rust.tf/libs124 Integrate `Error` trait with panic interfaces

(stalled change proposal) rust.tf/libs111 Restructure ptr_metadata to minimal support

(stalled change proposal) rust.tf/libs155 Arbitrary alternate flags in `std::fmt::Formatter`

(stalled change proposal) rust.tf/libs369 Implement more `ExactSizeIterators` on 64-bit platforms

(stalled change proposal) rust.tf/libs331 Support permanently skipping tests on a specific system

(stalled change proposal) rust.tf/libs262 Add infallible variant of RangeFrom::next()

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